Exodon Paradoxus without a doubt.
If you want to see some true shoaling characteristics, watch a tank full of these guys. Non stop action. This species never gets boring.
These fish Exodon Paradoxus i have seen on youtube awsome video. Could you put them with cichlids or other peaceful fish like loaches and catfish?
What do these fish go into, tetra's?
Seriously Watch...
Here is a link of them on youtube:
http/www.youtube.c...h?v=vEiXbOhKlQQ
closer look on them:
http/www.youtube.c...h?v=A2RqmXgGL2c